In message <4a8e.56751f36.39a11aa2 at aol.com>, EWKehren at aol.com writes:
>On all phase noise measurements I use AGM batteries.
Be aware that chemical batteries can be incredibly noisy, in particular
wet or semi-wet types.
It is not periodic noise, so for PN measurements with sensible
averaging periods it probably does not matter.
Poul-Henning
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